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let's be clear.
1- I said that according to existing law one must attend ones rite or its equivalent (which interpretation is part of the code which has been worked on constantly since 1870, that interpretation always included orthodox) before another rite.

2- Eastern codes are not uniform most are written by the patriarch himself and are not disseminated to the public. For example even though we have a canon of scripture, most rites who were at the same council have different lists

3- In general if someone say Dioscorus Pope of Alexandria was excommunicated the Synod would list their excommunication. It may or may not list his followers as cut off as well  it would be on this basis that the faithful would be told they could or could not attend a liturgy.
There would not be anything in writing. I do know for a fact that Rome gave written permission for Maronites and Jesuits to participate with schematics Jacobites and saw the docuмent Pius X gave the Jesuits.
I also never said that I think the faithful should attend any liturgy on a regular basis if they are not being communed

let's be clear.
1- I said that according to existing law one must attend ones rite or its equivalent (which interpretation is part of the code which has been worked on constantly since 1870, that interpretation always included orthodox) before another rite.

2- Eastern codes are not uniform most are written by the patriarch himself and are not disseminated to the public. For example even though we have a canon of scripture, most rites who were at the same council have different lists

3- In general if someone say Dioscorus Pope of Alexandria was excommunicated the Synod would list their excommunication. It may or may not list his followers as cut off as well it would be on this basis that the faithful would be told they could or could not attend a liturgy.
There would not be anything in writing. I do know for a fact that Rome gave written permission for Maronites and Jesuits to participate with schematics Jacobites and saw the docuмent Pius X gave the Jesuits.
I also never said that I think the faithful should attend any liturgy on a regular basis if they are not being communed

So no proof for your schismatic assertion.

you should be careful who you call schismatic especially as a Traditional Catholic. There are whole groups in church history who were labeled schismatic who said that new definitions being circulated were not traditional. Whole swathes of western Christendom declared Leo the Great a heretic for his definition..

I am very careful about labelling others as schismatic.  In this case, though, isn’t it obvious?  An organized religious group that openly and publicly rejects the authority of the pope, is clearly a schismatic group.  

If there was any doubt, I would refrain from using the term.  The orthodox groups all reject the authority of the pope, which makes each of them schismatic.